SW: TOR and Skyrim were both released at the end of 2011, so while they're 2011 games, they were primarily played in 2012 for most people.

Other than that, I'm not really sure what I ended up playing for most of 2012. I think the two top titles of 2012 for me are ME3 and Risen 2. ME3 was a great game until the last 10 minutes, and Risen 2 was a great game after getting used to it.